BACKGROUND: Percutaneous needle biopsy is routinely performed for renal allograft management. Vascular complications of the procedure include pseudoaneurysm and arterio-venous fistulae formation. Delayed diagnosis of these complications is due to their mostly asymptomatic and indolent nature.

CASE REPORT: We present a case of extensive intraparenchymal pseudoaneurysm formation within the inferior pole of the allograft, diagnosed two years following the most recent biopsy procedure.

CONCLUSIONS: Renal pseudoaneurysms may only be diagnosed years after their formation as they are typically asymptomatic.

Keywords: Biopsy, Needle - adverse effects, Aneurysm, False - etiology, computed tomography angiography, Kidney Failure, Chronic - surgery, Kidney Transplantation, Renal Artery